Q:What is a Liquid Crystal Display?

A:A Liquid Crystal Display (LCD) is an optical device that is commonly used to display ASCII characters and images on digital items such as watches, calculators, portable game consoles, etc. LCD is the technology used for displays in notebooks and other small computers. Like light-emitting diode and gas-plasma technologies, LCD allows displays to be much thinner than cathode ray tube (CRT) technology. LCD consumes much less power than LED and gas-displays because it works on the principle of blocking light rather than emitting it.

Q:What differentiates passive matrix LCDs from active matrix LCDs?

A:An LCD is made with either a passive matrix or an active matrix display grid. An active matrix has a transistor located at each pixel intersection, requiring less current to control the luminance of a pixel. For this reason, the current in an active matrix display can be switched on and off more frequently, improving the screen refresh time (your mouse pointer will appear to move more smoothly across the screen, for example). The passive matrix LCD has a grid of conductors with pixels located at each intersection in the grid.

Q:What are the advantages of TFT LCD compared with CRT?

A:In a CRT monitor, a gun shoots electrons and general light by colliding polarized electrons on fluorescent glass. Therefore, CRT monitors basically operate with an analog RGB signal. A TFT LCD monitor is a device that displays an input image by operating a liquid crystal panel. The TFT has a fundamentally different structure than a CRT: Each cell has an active matrix structure and independent active elements. A TFT LCD has two glass panels and the space between them is filled with liquid crystal. When each cell is connected with electrodes and impressed with voltage, the molecular structure of the liquid crystal is altered and controls the amount of inlet lighting to display images. A TFT LCD has several advantages over a CRT, since it can be very thin and no flickering occurs because it does not use the scanning method.

Q:Why is vertical frequency of 60Hz optimal for an LCD monitor?

A:Unlike a CDT monitor, the TFT LCD panel has a fixed resolution. For example, an XGA monitor has 1024x3 (R, G, B) x 768 pixels and a higher resolution may not be available without additional software processing. The panel is designed to optimize the display for a 65MHz dot clock, one of the standards for XGA displays. Since the vertical/horizontal frequency for this dot clock is 60Hz/48kHz, the optimum frequency for this monitor is 60Hz.

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Philips 220XW8 user manual What is a Liquid Crystal Display?, What are the advantages of TFT LCD compared with CRT?
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220XW8 specifications

The Philips 220XW8 is a versatile and innovative monitor designed to meet the needs of both professional and casual users. With its sleek design and advanced features, this monitor has become a popular choice among those looking to enhance their multimedia experience and productivity.

One of the standout features of the Philips 220XW8 is its impressive display. The monitor boasts a 21.5-inch screen size, providing ample real estate for multitasking and enjoying high-definition content. With a resolution of 1920x1080 pixels (Full HD), users can expect crisp and vibrant visuals, making it ideal for watching movies, playing games, and working on detailed graphics.

In terms of technology, the Philips 220XW8 utilizes IPS (In-Plane Switching) technology. This means it offers wide viewing angles of up to 178 degrees, ensuring that colors remain accurate and consistent regardless of the angle from which the screen is viewed. This is particularly beneficial for collaborative work environments where multiple users might need to view the display simultaneously.

The monitor also features an impressive response time of 5 milliseconds, minimizing motion blur during fast-paced action scenes or gaming sessions. Coupled with a 60 Hz refresh rate, the Philips 220XW8 ensures a smooth and enjoyable viewing experience, free from lag and ghosting.

Another notable characteristic of the Philips 220XW8 is its ergonomic design. The monitor comes with a height-adjustable stand, allowing users to position the screen at their preferred height for improved comfort during long working hours. Additionally, it supports VESA mounting, enabling easy wall-mounting options for those who prefer an uncluttered workspace.

For connectivity, the Philips 220XW8 is equipped with various input options, including HDMI, DVI, and VGA ports. This ensures compatibility with various devices, including laptops, desktops, and gaming consoles. Furthermore, the monitor features built-in speakers for convenient audio playback without the need for additional external speakers.

Another significant aspect of the Philips 220XW8 is its energy efficiency. The monitor is designed to consume minimal power while delivering high performance, aligning with modern sustainability efforts. It is certified with the Energy Star rating, helping users reduce their carbon footprint while enjoying quality entertainment or productive work.

Overall, the Philips 220XW8 combines aesthetic appeal with advanced technologies to provide an exceptional viewing experience. With its impressive display quality, ergonomic features, and connectivity options, it is a compelling choice for anyone looking to enhance their computing setup.
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